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A global analysis of groundwater recharge for vegetation, climate, and soils

Kim, JH, RB Jackson
Vadose Zone Journal
Journal Volume/Pages: 
11, 1

Because ground water is an essential resource for people and for ecosystems, a better understanding is needed for the fundamental controls on recharge and its interactions with vegetation change. We analyzed >600 estimates of groundwater recharge and deep drainage (as a proxy for recharge) to obtain the first global analysis of recharge and vegetation types. We used a regression model with the following predictors: vegetation type, water input (WI=precipitation+ irrigation), potential evapotranspiration (PET), saturated hydraulic conductivity based on soil texture (Ks), and seasonality of rainfall. Globally, croplands had the highest proportion of WI that became recharge of all vegetation types, followed by grasslands, woodlands, and scrublands (average proportional recharge: 0.11, 0.08, 0.06, and 0.05, respectively; P

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